need help [!!!!Spoilers!!!!!]

[eyesore]

Im at the part where you're on the buggie. and theres like a tanker trunka cross the road. and you had to go in and kill the guards. and there is like a big door blocking so i cant get through. How do I open that door?

[gus]

If your talking about the part im thinking of you have to gather 3 batteries and insert them into the 3 slots. They will turn green when you enter each battery. (Hint) The third battery is a little harder to find.

3rd battery is in a car hood